The Chill Revival: A History of Cold-Water Immersion and Its Modern Appeal

Cold-water bathing, once a staple for treating ailments, has experienced a modern resurgence in popularity, fueled by celebrity endorsements and claims of enhanced well-being. From ancient practices to contemporary wellness trends, the pursuit of cold exposure continues to captivate those seeking physical and mental benefits. Although, a closer seem at the science reveals a nuanced picture, separating hype from genuine advantages.

A Historical Plunge

The practice of utilizing cold water for therapeutic purposes dates back millennia. Ancient Greeks and Romans employed cold-water immersion to manage fevers . In the 18th century, mental institutions experimented with “surprise baths”—sudden immersions in cold water—aimed at jolting patients out of depression or psychosis. Some practitioners even limited the cold exposure to the head, believing it could cure “hot brain.”

The Celebrity Effect and Modern Trends

More recently, the practice gained renewed attention with endorsements from public figures. In 2024, Casey Means, President Trump’s pick for surgeon general, shared her enthusiasm for cold plunges on Instagram, citing the activation of “brown fat” as a key benefit. Similarly, Mehmet Oz, now the head of Medicaid and Medicare, posted a video of himself in an ice bath, promoting it for immunity and longevity. Athletes like LeBron James and Michael Phelps have also popularized cold-water immersion as a recovery tactic, often seen in post-workout ice baths.

The Science of Cold Exposure: Separating Fact from Fiction

While cold exposure demonstrably dampens inflammation, a contributor to heart disease and cancer risk, some of the more sensational claims require scrutiny. The idea that cold plunges significantly activate “brown fat” – a type of fat tissue that burns energy – and lead to dramatic health improvements is largely overstated. Most adults possess limited amounts of brown fat, minimizing the potential impact. Even studies on Wim Hof, known as “The Iceman” for his tolerance to extreme cold, found his brown fat activation to be “unremarkable.”

The benefits for workout recovery are also debated. While some studies suggest cold-water immersion may reduce muscle soreness, others indicate it can hinder muscle growth and strength gains. A 2015 study, for example, found that cold plunging after resistance training reduced muscle growth by 20 percent.

Heat vs. Cold: A Shifting Paradigm

Emerging research suggests that heat exposure may be more beneficial than cold for muscle health and recovery. Contrast therapy – alternating between hot saunas and cold plunges – is popular, but the heat component appears to be the more impactful element. The cardiovascular and cellular benefits of heat adaptation are maximized when the core body temperature reaches around 101.3 degrees Fahrenheit, a threshold often missed when immediately followed by a cold plunge.

Studies have shown that warming muscles aids recovery and reduces soreness more effectively than cooling them. Even the originator of the RICE (rest, ice, compression, elevation) protocol for injury recovery has since retracted the “ice” component, recognizing that inhibiting inflammation can also inhibit healing.

The Psychological Impact and the Feel-Good Factor

Despite the mixed scientific evidence, the enduring appeal of cold-water immersion may lie in its psychological effects. Research indicates that cold exposure releases stress hormones and serotonin, contributing to a sense of well-being and mental clarity. A large-scale study in the Netherlands found that individuals who ended their showers with cold water reported fewer workdays missed, even though total illness days were comparable to a control group.

The experience can be transformative, shifting focus away from daily stressors and creating a sense of mental resilience. The communal aspect, as experienced at events like Sauna Days, can further enhance the benefits, turning a potentially isolating practice into a bonding experience.

Looking Ahead

While the hype surrounding cold plunging may exceed the scientific evidence, the practice offers potential benefits for both physical and mental health. Future research, with larger and more diverse study groups, is needed to fully understand the long-term effects of cold-water immersion and to refine best practices. For now, approaching cold exposure with a balanced perspective – recognizing its limitations and embracing its potential psychological benefits – is key.